package com.jy.wms.common.base;

import java.util.*;

public class OrderedProperties extends Properties {  
   
    private static final long serialVersionUID = -4627607243846121965L;  
       
    private final LinkedHashSet<Object> keys = new LinkedHashSet<Object>();  
   
    @Override
	public Enumeration<Object> keys() {  
        return Collections.<Object> enumeration(keys);  
    }  
   
    @Override
	public Object put(Object key, Object value) {  
        keys.add(key);  
        return super.put(key, value);  
    }  
   
    @Override
	public Set<Object> keySet() {  
        return keys;  
    }  
   
    @Override
	public Set<String> stringPropertyNames() {  
        Set<String> set = new LinkedHashSet<String>();  
   
        for (Object key : this.keys) {  
            set.add((String) key);  
        }  
   
        return set;  
    }  
}
